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13 cards from this deck
Ensures data received is suitable for processing
Bad data input produces bad/unreliable results
Verifies input has correct number of characters
4-digit PIN, postcode validation
Counts characters in input
Ensures user entered something, not blank input
Prevents processing empty data that causes errors
len(key) == 0
key == ""
Verifies value falls between acceptable limits/boundaries
Work for both numbers and text characters
Relational (<, >, <=, >=) and Boolean (and, or) operators
Use multiple checks together for thorough data validation
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